Enclosed switchboard having instruments needed for regular inspection and operation mounted on a middle level door

Abstract

An enclosed switchboard in which an upper chamber and a lower chamber are formed within a switchboard frame in the form of a box for accommodating electrical apparatus such as circuit breakers. At the free surfaces of the frame facing the two chambers a top level door and a bottom level door facing the two chambers are mounted so as to be capable of being opened and closed separately from one another. A middle level door for the mounting of instruments is mounted between the top level door and bottom level door, and instruments needed for regular inspection and control, for instance meters, operating switches, indicator lamps and the like, are mounted on the door surface of the middle door.

What is claimed to be new and desired to be secured by Letters Patent of the United States is: 
     
       1. An enclosed switchboard, comprising: a switchboard frame having formed therein an upper apparatus accommodating chamber and a lower apparatus accommodating chamber, said chambers containing electrical apparatus,   a top level door and a bottom level door mounted at the free surfaces of said frame facing the two chambers so as to be capable of being opened and closed separately from one another, said top and bottom level doors having mounted thereon first instruments which are restricted to instruments that do not indicate the operating state of the accommodating electrical apparatus; and   a middle level door provided between said top level door and bottom level door and having mounting holes provided in its door surface, second instruments restricted to the type needed for regular inspection and operation being mounted in said mounting holes and catches causing the middle level door to follow the opening movement of either the upper level door or the lower level door.   
     
     
       2. The enclosed switchboard recited in claim 1 wherein: the second instruments mounted in the middle level door include an operating switch and an indicator lamp.   
     
     
       3. The enclosed switchboard recited in claim 1 wherein: said second instruments include a meter. 
     
     
       4. The enclosed switchboard recited in claim 1 wherein: the mounting holes for second instruments mounted on the middle level door include a hole covered by a blank plate on which a circuit diagram is inscribed.   
     
     
       5. The enclosed switchboard recited in claim 1 wherein: the middle level door has an instrument mounting hole covered by a blank plate, the blank plate having a spare parts and accessories container tube fitting into the instrument mounting hole.   
     
     
       6. The enclosed switchboard recited in claim 1 including: a mounting block for control circuit parts mounted in the switchboard frame facing the middle level door.   
     
     
       7. The enclosed switchboard recited in claim 6 wherein: said mounting block for control circuit mounting parts is removable from the switchboard frame.   
     
     
       8. The enclosed switchboard recited in claim 6 wherein: control circuits of electrical apparatus accommodated in the upper and lower apparatus accommodating chambers can be plugged into the mounting block for control circuit parts.   
     
     
       9. An enclosed switchboard, comprising: a switchboard frame having formed therein an upper apparatus accommodating chamber and a lower apparatus accomodating chamber, said chambers containing electrical apparatus,   a top lever door and a bottom level door mounted at the free surfaces of said frame facing the two chambers so as to be capable of being opened and closed separately from one another, said top and bottom level doors having mounted thereon first instruments which are restricted to instruments that do not indicate the operating state of the accomodating electrical apparatus; and   a middle level door provided between said top level door and said bottom level door and having mounting holes provided in its door surface, second instruments restricted to the type needed for regular inspection and operation being mounted in said mounting holes; and   said electrical apparatus accommodated in said switchboard frame comprises: circuit breakers,   a control frame mounted in the switchboard frame facing the middle level door for accommodating circuitry for the circuit breakers, and a catch connected to one of the top and bottom level doors causing the middle level door to follow the opening movement of the one of the top and bottom level doors.